An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13116 Search : far
inverse Compton effect
  ا ُسکر ِ کامپتون ِ وارون   
oskar-e Compton-e vârun

Fr.: effet Compton inverse   

A → scattering process by which fast-moving, energetic particles transfer energy to photons, decreasing the wavelength of the radiation.

inverse; → Compton effect.

inverse P Cygni line profile
  فراپال ِ P Cygniی ِ وارون   
farâpâl-e P Cygni-ye vârun

Fr.: profil P Cygni inverse   

A line profile in which the emission is on the blue side of the absorption. It is usually interpreted as the redshift of the absorption component relative to emission lines, which necessitates infall of matter.

inverse; → P Cygni; → line; → profile.

inverse square law
  قانون ِ توان ِ دوی ِ وارون، قانون ِ چاروش ِ وارون   
qânun-e tavân-e do-ye vârun, qânun-e câruš-e vârun

Fr.: loi en carré inverse   

A force law that applies to the → gravitational and → electromagnetic forces in which the magnitude of the force decreases in proportion to the inverse of the square of the → distance.

inverse; → square; → law.

inverse Zeeman effect
  اُسکر ِ زیمن ِ وارون   
oskar-e Zeeman-e vârun

Fr.: effet Zeeman inverse   

The → Zeeman effect obtained in absorption. The phenomenon is observed by sending white light through an absorbing vapor when the latter is subjected to a uniform magnetic field. The laws governing the inverse effect are similar to those for the direct effect.

inverse; → Zeeman effect.

inversion
  واگردانی، وارونش   
vâgardâni, vâruneš

Fr.: inversion   

Meteo.: A departure from the usual decrease or increase with altitude of the value of an atmospheric property. It almost always refers to a temperature inversion, i.e., an increase in temperature with altitude. Chemistry: To subject to → inversion.

Verbal noun of → invert.

inversion layer
  لایه‌ی ِ واگردانی   
lâye-ye vâgardâni

Fr.: couche d'inversion   

Meteo.: The atmospheric layer in which the temperature gradient is inverted, that is increases; → inversion. The inversion layer tends to prevent the air below it from rising, thus trapping any pollutants that are present.
Electricity: A converting of direct current into alternating current.

inversion; → layer.

invert
  واگرداندن، وارونیدن   
vâgardândan, vârunidan

Fr.: inververtir, renverser   

To turn upside down.
To reverse in position, order, direction, or relationship. → inversion layer.

From M.Fr. invertir, from L. invertere "turn upside down, turn about," from → in- "in, on" + vertere "to turn;" cf. Pers. gardidan, gaštan "to turn, to change;" Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vartati; O.H.G. werden "to become;" PIE base *wer- "to turn, bend."

Vâgardândan, from vâ-, → re-, + gardândan, from gardidan "to turn; to change," from Mid.Pers. vartitan; Av. varət- "to turn, revolve;" cf. Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."
Vârunidan, infinitive of vârun, → inverse.

inverted population
  پرینش ِ واگردانیده، ~ وارون   
porineš-e vâgardânidé, ~ vârun

Fr.: population inversée   

In atomic physics, a condition in which there are more electrons in an upper energy level than in a lower one, while under normal conditions of thermal equilibrium the reverse is true. → optical pumping.

Inverted, p.p. of → invert; → population.

inviscid
  ناوشکسان   
nâvošksân

Fr.: non visqueux   

Fluid mechanics: Having no → viscosity. Same as → nonviscous.

From → in- "non-" + viscid, from L.L. viscidus, from vis(cum) "anything sticky, mistletoe," → viscous, + -idus.

invocation
  در-وچ، دروچ   
darvac

Fr.: invocation   

The act of invoking.

Verbal noun of → invoke.

invoke
  در-وچیدن، دروچیدن   
darvacidan

Fr.: invoquer   

1) to call for with earnest desire; make supplication or pray for.
2) to call on (a deity, Muse, etc.), as in prayer or supplication.
3) To declare to be binding or in effect (to invoke the law; to invoke a veto).
4) To appeal to, as for confirmation.
5) To petition or call on for help or aid.

M.E., from M.Fr. envoquer, from L. invocare "call upon, implore," from → in- "upon" + vocare "to call," from vox, → voice.

Darvacidan, from dar-, → in-, + vacidan "to call," rarr; convoke.

Io (Jupiter I)
  یو   
Yo (#)

Fr.: Io   

1) The fifth of → Jupiter's known moons and the third largest. It is the innermost of the → Galilean satellites. With a diameter of 3630 km, Io is slightly larger than Earth's Moon. It revolves at a mean distance of 422,000 km from Jupiter. Its mass is 8.93 x 1022 kg (about 1.2 Earth Moons) and its → orbital period 1.8 Earth days. The mean → surface temperature of Io is -155 °C. Io's yellow color derive from → sulfur and molten → silicate rock. The unusual surface of Io is kept very young by its system of active → volcanoes. The intense → tidal force of Jupiter stretches Io and damps wobbles caused by Jupiter's other Galilean moons. The resulting friction greatly heats Io's interior, causing molten rock to explode through the surface. Io's volcanoes are so active that they are effectively turning the whole moon inside out. Some of Io's volcanic lava is so hot it glows in the dark.
2) Also the name of an → asteroid numbered 85.

In Gk. mythology, Io was a maiden who was seduced by Zeus (Jupiter). When Hera came upon their rendez-vous, Zeus transformed the maiden into a white heifer.

iodine
  یود   
yod (#)

Fr.: iode   

A nonmetallic chemical element; symbol I; atomic number 53; atomic weight 126.9045; melting point 113.5°C; boiling point 184.35°C.

Iodine, coined 1814 by British chemist Sir Humphry Davy from Fr. iode "iodine," coined 1812 by Fr. chemist Joseph Louis Gay-Lussac (who proved it was an element) from Gk. ioeides "violet-colored," because of its violet vapors. Despite the priority rights dispute between Davy and Gay-Lussac, both acknowledged Courtois as the discoverer of the element.

Yod, from Fr. iode, as above.

ion
  یون   
yon (#)

Fr.: ion   

An atom that has lost or gained one or more electrons and has become electrically charged as the result.

Ion (introduced in 1834 by E. physicist and chemist Michael Faraday), from Gk ion " going," neut. pr.p. of ienai "to go," from PIE base *ei- "to go, to walk," eimi "I go;" cf. Pers. ây-, â- present stem of âmadan "to come;" O.Pers. aitiy "goes;" Av. ay- "to go, to come," aēiti "goes;" Skt. e- "to come near," eti "arrival;" L. ire "to go;" Goth. iddja "went," Lith. eiti "to go;" Rus. idti "to go."

Yon, from Fr., from Gk., as above.

ion rays
  پرتوهای ِ یونی   
partowhâ-ye yoni (#)

Fr.: rayons ioniques   

The thin glowing streamers in a comet's ion tail.

ion; → ray.

ion tail
  دنباله‌ی ِ یونی   
donbâle-ye yoni (#)

Fr.: queue d'ions   

Of a comet, same as → gas tail.

gas; → tail.

ionic
  یونی   
yoni (#)

Fr.: ionique   

Of or pertaining to ions; occurring in the form of ions.

From → ion + → -ic.

ionic abundance
  فراوانی ِ یونی   
farâvâni-ye yoni

Fr.: abondance ionique   

A quantity, pertaining to an ion of a chemical element, expressing the relative number of the ion with respect to that of hydrogen.

ionic; → abundance.

ionic molecule
  مولکول ِ یونی   
molekul-e yoni

Fr.: molécule ionique   

A molecule that consists of the ions of the chemical elements that make up the molecule.

ionic; → molecule.

ionization
  یونش   
yoneš (#)

Fr.: ionisation   

The process by which ions are produced, typically occurring by interaction with electromagnetic radiation ("photoionization"), or by collisions with atoms or electrons ("collisional ionization").

Verbal noun of → ionize.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con con con con con con con con con con con con coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>